TEN YEAR PLANNING GUIDE SHASTA LAKE ELECTRIC UTILITY
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1 TEN YEAR PLANNING GUIDE SHASTA LAKE ELECTRIC UTILITY P+ PowerPlus Engineering A Department of STAR Energy Services, LLC
2 TEN YEAR PLANNING GUIDE SHASTA LAKE ELECTRIC UTILITY CITY OF SHASTA LAKE, CA Prepared by PowerPlus Engineering P+ PowerPlus Engineering A Department of STAR Energy Services, LLC
3 P+ PowerPlus Engineering A Department of STAR Energy Services, LLC Thomas E. Nigon, P. E. 115 S. 5 th Ave., Suite 501 Timothy E. Smith La Crosse, WI Phone: (608) Fax: (608) tnigon@powerpluseng.com July 29, 2011 City Council City of Shasta Lake 1650 Stanton Drive Shasta Lake, CA Attention: Tom Miller Electric Utility Director Dear Council Members: We are pleased to present our Report on the Ten Year Plan which has been prepared for your electric distribution system. This report presents the results of studies made to determine the ten year requirements for your electric system. The report provides recommendations for the development of the electric system to accommodate load growth and improve reliability for the next 10 years. The ten year plan analysis is based on providing electric service to approximately 5,000 customers with a peak load of approximately 23 MW (not including Knauf demand) that is estimated to occur in the next ten years. The majority of recommendations for electric improvements to serve the existing and new loads include rebuilding feeder ties to improve reliability and replacing the substation voltage regulators in Central Valley substation. The estimated investment over the next 10 years is approximately $13.2 million in 2011 dollars. We thank you for allowing us to provide you with professional consulting services. Sincerely, Tom Nigon, P.E.
4 Table of contents, list of tables and figures 1 EXECUTIVE SUMMARY PLANNING CRITERIA General Primary Lines and Distribution Configuration Voltage Levels Loading Limits Equipment Loading Guidelines Substation Equipment Loading During Load Transfer Recloser Loading Single-Phase Line Loading Economic Conductor Size Reliability Environmental Considerations Power Supply Distributed Generation LOAD PROJECTIONS Background Load Forecast Land Use Analysis Design Load and Allocation Substation Load Projection Distribution Feeder Load Projection ANALYSIS OF EXISTING SYSTEM Power Supply and Transmission Distribution General Description Reliability Substations Current System Studies Coordination Study Master Plan Load Forecast Distribution Feeders Feeder capacity and voltage Energy losses EXPLORATORY PLANS Comparison Analysis Assumptions Transmission Options Substation Options Distribution Options RECOMMENDED PLAN General New Transmission Lines Transmission Line Upgrades Shasta Lake Ten Year Plan i
5 6.4 Substations Additions and Upgrades Distribution lines of substations Central Valley Feeder A Distribution Central Valley Feeder B Distribution Central Valley Feeder C Distribution Central Valley Feeder D Distribution Central Valley Feeder E Distribution Central Valley Feeder F Distribution Service Extensions to New Customers Service Upgrades Pole Replacements and System Improvements Overhead Single-Phase and Cable Replacements Fused Cutouts and Arresters Reclosers Capacitors Voltage Regulators Advanced Metering Infrastructure COST ESTIMATE SUMMARY Unit Cost Estimates Distribution Projects Cost Estimate Substation and Transmission Projects Cost Estimate Cost Estimate for Ten-Year Plan CONCLUSION SOURCES USED IN THIS REPORT APPENDIX System Load, Consumer Data and Losses Conductor Loading Tables Cost Estimate for Central Valley No. 1 Transformer System Model Data System Maps Table 1 Economic Conductor Size for 1-Phase Overhead Lines... 7 Table 2 Economic Conductor Size for 3-Phase Overhead Lines... 7 Table 3 Economic Conductor Size for 3-Phase Underground Lines... 8 Table 4 Average Annual SAIFI and SAIDI (minutes) for Six Utilities Table 5 Annual Growth Forecast Table 6 kw Annual Peak Demands and Growth Factors Table 7 Substation Peak kw Demand Ten Year Forecast Table 8 Feeder Loading from Summer 2008 SCADA Table 9 Feeder Demands for Electrical Model Table 10 Average Annual Outage Reliability Indexes Table 11 Outage Comparison with Neighboring Utilities Table 12 Substation Equipment Table 13 Existing and 10-year Substation Loading Table 14 Substation Site Visit Review Summary Table 15 Highest Voltage Drop Location with 10-Year Peak Feeder Loads Table 16 Feeder Voltage with Mt. Gate Load Addition Table 17 Energy Losses 2009 for City of Shasta Lake Table 18 Loss Benchmarks for Rural Electric Shasta Lake Shasta Lake Ten Year Plan ii
6 Table 19 Energy Loss Comparison Table 20 Cost of Losses Table 21 Cost Estimate Rewind CV Table 22 Cost Estimate Replace CV1 with 25/47 MVA Transformer Table 23 Cost Estimate Replace CV1 with 15/25 MVA Transformer Table 24 Secondary Voltage with CV1 Tap at 120, Table 25 Cost Estimate with CV1 Tap to 120,750 volts Table 26 Cost Estimate for Feeder Ties with Mt. Gate Substation Table 27 Feeder Loading with Load Transfer Table 28 Mt. Gate Load Forecast Table 29 Cost Estimate for Substation for Mt. Gate Development Table 30 Cost Estimate to Extend New Feeders for Mt. Gate Development Table 31 Distribution Projects Details Table 32 Maximum Fault Current for Distribution Transformers Table 33: Unit Cost Estimates Table 34 Distribution Project Cost Estimate Table 35 Substation Upgrades Cost Estimate Table 36 Ten-Year Estimate of Equipment Quantity Table 37 Ten-Year Total Cost Summary Table 38: Peak Demand and Energy Use Central Valley Substation Table 39 Energy Purchase, Sales and Losses Central Valley Table 40 Distribution Transformer Loss Estimate Table 41 Overhead Conductor Rating in Amps Table 42 Overhead Conductor Constants for Amp Ratings Table 43 Overhead Secondary Amp Rating Table 44 Underground Secondary Amp Rating Table 45 Underground 15 kv Cable Rating in Amps Table 46 Maximum Current Annealing of No. 2 ACSR Table 47 Maximum Current Annealing of 397 ACSR Table 48 Maximum Current Insulation Damage No. 2 AL Cable Table 49 Maximum Current Insulation Damage 750 AL Cable Figure 1 Feeder Configuration - Underground Distribution... 4 Figure 2 Transformer Failure Model Figure 3 One-Line Diagram Mt. Gate Development Substation Option Figure 4 One-Line Diagram Mt. Gate Development Distribution Option Shasta Lake Ten Year Plan iii
7 1 EXECUTIVE SUMMARY This plan covers a ten year system planning period for the City of Shasta Lake Electric Utility (Shasta Lake). Shasta Lake is headquartered in Shasta Lake, California. Shasta Lake is a municipal electric utility serving the City of Shasta Lake. The economy of the area is based primarily on commercial and light industry. Employment growth in the area is due to expansion in the retail and services such as tourism. The area has growth from residential developments located within the City of Shasta Lake. Shasta Lake serves the large industrial customer Knauf Insulation. The City of Shasta Lake is expected to have low to moderate growth in electrical use over the next 10 years. This long range plan presented in this report is based on a design load of 23 MW. This demand doesn t include the demand for the Knauf substation which is a dedicated substation for a large industrial customer. This design load is approximately 1.1 times the past peak load and is estimated to occur in approximately 10 years. The proposed distribution plan includes the following recommended improvements over the next 10 years. The list is prioritized by importance and the estimated timing where the lower numbered projects have a higher priority and are estimated to be completed during the initial time period of the ten year planning period: 1. Update the master SCADA 2. Upgrade Central Valley substation with new voltage regulators 3. Provide service extensions for approximately 500 new members 4. Replace 400 poles 5. Upgrade 2.8 miles of existing distribution 6. Upgrade Central Valley substation with an expanded control house and updated relaying 7. Install new feeders and ties when the Mt. Gate development begins and monitor load growth for a possible future new substation 8. Continue to monitor the condition of the Central Valley substation and replace with a new transformer based on the transformer condition and operating concerns 9. Flanagan upgrade will be planned with WAPA and no cost estimate is available at this time so this upgrade is not included in this plan The estimated investment over the next 10 years is approximately $13.2 million in 2011 dollars. This plan does not include a review of the Flanagan 230 to 115 kv substation. This substation is included in the planning process under a separate agreement with WAPA. Shasta Lake Ten Year Plan
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